fix(deps): update dependency webextension-polyfill to ^0.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webextension-polyfill	^0.8.0 -> ^0.12.0

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Release Notes

mozilla/webextension-polyfill (webextension-polyfill)

v0.12.0

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Bug Fixes

• Removed unnecessary webpack and webpack-cli npm packages from webextension-polyfill npm package dependencies (#​614) (https://github.com/mozilla/webextension-polyfill/issues/604)

See all changes for 0.12.0

• https://unpkg.com/webextension-polyfill@0.12.0/dist/

v0.11.0

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Bug Fixes

• Fix no-op check to work with Safari and support of old browsers (#​582) (https://github.com/mozilla/webextension-polyfill/issues/364)

See all changes for 0.11.0

• https://unpkg.com/webextension-polyfill@0.11.0/dist/

v0.10.0

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Bug Fixes

• Removed obsolete deprecation warning logged on sendResponse callback calls (#​386)

See all changes for 0.10.0

• https://unpkg.com/webextension-polyfill@0.10.0/dist/

v0.9.0

Compare Source

Bug Fixes

• enable webextension-polyfill usage via webpack ProvidePlugin (#​351)

See all changes for 0.9.0

• https://unpkg.com/webextension-polyfill@0.9.0/dist/

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